Re: Sparse-merge

[David Bateman]

John W. Eaton wrote:

> On  8-Mar-2005, Richard Hindmarsh <address@hidden> wrote:
>
> | Thanks. Will 2.9.x (or does the main trunk) have an interface to ARPACK 
> | (e.g. through "eigs"), or is anyone working on this?
>
> Not yet.  SEe the list of projects for sparse matrices in the file
>
>  http://www.octave.org/cgi-bin/viewcvs.cgi/octave/PROJECTS?rev=1.60&view=auto
>
> David Bateman, who wrote much of the sprase code, may have some
> additional ideas about how to implement eigs.  If you are interested
> in helping, please let us know.
>
> Thanks,
>
> jwe
>  

ARPACK is definitely on the todo list. It is a complete lack of time at 
the moment that will prevent me from doing something here.

The priority for me at the moment is to complete the direct solver code, 
this means fix up the matrix type caching code, using TAUCS to implement 
the sparse Cholesky solver and identify the QR solver for the minimum 
norm solution. TAUCS has the advantage that it has drop tolerances and 
the cholinc function can also directly be implemented. I believe that 
Andy Adler wanted to look at this, so I won't touch this till he has had 
a chance at it.

If you want to do the ARPACK interfacing, I'd welcome the help and would 
be willing to vet the code and give pointers.

Regards
David

--
David Bateman                                address@hidden
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 1 69 35 77 01 (Fax) 
91193 Gif-Sur-Yvette FRANCE

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